cmake_minimum_required(VERSION 3.12)
project(CMakeManual NONE)
set(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake")
find_package(Sphinx REQUIRED)

if(NOT DEFINED SPHINX_THEME)
  set(SPHINX_THEME default)
endif()

if(NOT DEFINED SPHINX_THEME_DIR)
  set(SPHINX_THEME_DIR)
endif()

# configured documentation tools and intermediate build results
set(BINARY_BUILD_DIR "${CMAKE_CURRENT_BINARY_DIR}/_build")

# Sphinx cache with pickled ReST documents
set(SPHINX_CACHE_DIR "${CMAKE_CURRENT_BINARY_DIR}/_doctrees")

# HTML output directory
set(SPHINX_HTML_DIR "${CMAKE_CURRENT_BINARY_DIR}/html")

configure_file(
  "${CMAKE_CURRENT_SOURCE_DIR}/conf.py.in"
  "${BINARY_BUILD_DIR}/conf.py"
  @ONLY)

add_custom_target(CMakeManual ALL
  ${SPHINX_EXECUTABLE}
  -q -b html
  -c "${BINARY_BUILD_DIR}"
  -d "${SPHINX_CACHE_DIR}"
  "${CMAKE_CURRENT_SOURCE_DIR}"
  "${SPHINX_HTML_DIR}"
  COMMENT "Building HTML documentation with Sphinx")
